Portable power supply



FIG. 1 is a perspective view of a portable power supply showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in the drawings are employed to show unclaimed portions of the portable power supply, and form no part of the claimed design. 

CLAIM The ornamental design for a portable power supply, as shown and described. 